Excavator



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2 t e w u. e e h S 2 v. Uu. Nw 0T LA AM MG -X .JE DL No. 556,012lPatented Mar. 10, 1896 UNITED STATES PATENT OEEICE.

PETER J. MALONEY, OF WORCESTER, MASSACHUSETTS.

EXCAVATO R.

SPECIFICATION forming part of Letters Patent No. 556,012, dated March10, 1896.

Application tiled June 7,1895. Serial No. 552,043. (No model.)

To aZZ whom it may concern:

Beit known that I, PETER J. MALONEY, a citizen of the United States,residing at lVorcester, in the county of Vorcester and State ofMassachusetts, have invented certain new and useful Improvements inExcavators, of which the following is a specification.

My invention relates to an excavator, and the object of my invention isto provide an excavator attachment adapted to be applied to and combinedwith the movable inclined boom of any ordinary hoisting-derrick.

My excavator attachment consists of a slide or carriage adapted to becombined with the inclined boom of a derrick and to travel freelythereon in the direction of the length of the boom, and a devicecombined with said carriage to prevent its moving on the boom, saiddevice under the control of the operator, in combination with thebucket-boom which has no longitudinal motion and is pivoted at its innerend to the carriage above mentioned and moves with said carriage, andthe excavating-bucket rigidly attached to the outer end of said boom,and provided with hoisting-tackle for operating said bucket, to move itin the arc of a circle to excavate, and for moving the carriage on theinclined boom, to carry the bucket to the desired position, as will behereinafter fully described.

Referring to the drawings, Figure l is a side view of a hoisting-derrickwith my excavator attachment combined therewith. The dotted lines showthe lowered position of the derrick-boom and excavator-bucketpreparatory to excavating and also the raised position of the bucketafter excavating. Fig. 2 is a plan view of the carriage which travels onthe boom of the derrick, to which one end of the bucket-boom ispivotally attached, and of the device for lookin g the carriage on theboom. Fig. 8 is a section on line 3 3, Fig. 2, looking in the directionof arrow a, same iigure; and Fig. fl isla section on line 4 4, Fig.2,looking in the direction of arrow b, same ure. Figs. 2, 3, and et areshown on an enlarged scale.

In the accompanying drawings I have shown a hoisting-derrick of ordinaryconstruction consisting of the upright mast l,

mounted at its lower end to revolve in the base-block 2, and the movableinclinedboom 3, preferably square in cross-section, and hoisting-tackle4 for raising and lowering the outer end to the boom 3,*to vary theinclination thereof, all in the usual way.

I will now describe my excavator attachment adapted to be combined withthe boom 3 of the derrick, so that the same may be used as an excavator.

I provide a slide or carriage 5, adapted to be supported or mounted onthe boom 3, to travel freely thereon in the direction of the length ofthe boom. Said carriage 5 is preferably made, as shown in the drawings,in two parts or sections 5 and 5, which extend upon opposite sides ofthe boom and also upon the bottom and top thereof, as shown in Fig. 4i.The two parts 5 and 5 of the carriage 5 are secured together to allowsaid carriage to travel freely on the boom in the direction of itslength by a bolt G, having a sleeve or washer 7 thereon and extendingthrough openings in ears or projections S on the parts 5' and 5" at theupper side of the boom, and a second bolt 9 having a sleeve or washeri() thereon and extending through ears or lugs 1l on the partsv 5' and55 at the lower side of the boom. (See Figs. 2, 3, and et.)

In order to have the slide or carriage 5 travel freely on the boom 3,and with as little friction as possible, I preferably employ two rollsor small wheels l2 combined with the carriage 5, which travel on theupper side of the boom, as shown inFig. 3. The wheels 12 in thisinstance extend between the two parts 5' and 5 of the carriage 5 and aremounted on short shafts 18, which have their bearings in stands orprojections 14, on the upper inner part of said sections 5'I and 5".(See Figs. 2 and 3.)

In order to hold or lock the carriage 5 at any point on the boom 3 andprevent it from traveling up or down thereon in the operation ofexcavating, I provide a device consisting in this instance of a U-shaped loop or strap 15, extending upon the lower surface and the sidesof the boom and provided with arms 15, pivotallyattached to the lowerend of the carriage 5 by bolts 16. To operate the IOO strap 15 and drawit against the lower surface of the boom, to lock or hold the carriage 5thereon, l employ in this instance an eccentric lever 17, supported on arod 18, mounted in the upper ends of the strap 15, and pro vided with aspring 19, which acts to hold the eccentric lever 17 from bearing on thetop surface of the boom. (See Fig. A cord 2O is attached to the end ofthe lever 17, and passes over a pulley 21 on the mast 1, and extendsdown within easy reach of the operator.

lVhen it is desired to hold or lock the can riage 011 the boom andprevent its traveling up or down thereon, the eccentric lever 17 ispulled by the cord 2O and acts, as shown in Fig. 3, to raise the strap15 and draw the lower part thereof against the lower side of the boom toclamp the strap 15 thereon, and thus hold or lock the carriage on theboom.

To the carriage 5 is pivotally attached the inner end of the bucket-boom22, in this instance by a bolt 23 extending through openings 24 in thedownwardly-extending lugs 11 of the carriage 5. The bucket-boom 22 docsnot have any longitudinal motion and holds the bucket 25, which isrigidly attached toits outer end, always at the same distance from thesupporting-carriage 5.

The excavating-bucket 25 may be of any ordinary shape and constructionand is provided with a hinged bottom 26 and a spring lock-bolt 27,operated by a cord 28 in the usual way, and a bail 29, to which isattached the hoisting-tackle. The rope 30 of the hoisting-tackle isattached at one end to the end of the inclined boom 3 and passes over aseries of pulleys to the foot of the upright mast 1 in the usual way.

From the above description, in connection with the drawings, theoperation of my cxca vator attachment, combined with the movableinclined boom of a hoisting-derrick, will be readily understood by thoseskilled in the art.

By means of the traveling slide or carriage of the excavator attachment,which supports the bucket-boom and bucket I am enabled to excavate at adistance from the foot oit' the derrick or near the foot ol the derrick,as desired, and to carry the bucket to dump the excavated material atany point within the plane of operation of the derrick; forno matter howlong the boom of the derrick is I can cause the carriage mounted on saidboom to travel from the lower end to the upper end thereof by simplydrawing on the hoisting tackle attached to the bucket, and by looseningsaid tackle the carriage will travel by gravity toward the lower end ofthe boom. By means of the eccentric lever 17 the carriage is held orlocked at any desired point on the boom.

In the operation of excavating the carriage is moved up or down on theboom of the derrick according to the distance from the foot of thederrick it is desired to exeavate. In

case it is desired to excavate at some distance from the foot of thederrick, as shown in Fig. 1, the carriage is drawn up on the boom andheld thereon by the eccentric lever 17, as shown by full lines in Fig. 1so that the bucket will swing clear. The boom 3 is now lowered, causing'the bucket to come in contact with the ground and the carriage 5 totravel up on the boom, as shown by dotted lines, Fig. 1, the eccentriclever 17 having been released. rlhe eccentric lever 17 is again operatedto hold the carriage on the boom, andthe hoisting-tackle attached tothebucket is operated to draw the bucket through the material to beexcavated, the weight of the boom forcing the bucket into the material.After the bucket has excavated and has been raised, as shown by dottedlines at the right in Fig. 1, the inclined boom 3 may be raised and thebucket carried toward the derrick to dump its contents by opcrating theeccentric lever 17 to release the carriage 5,and when it has reached.the desired position the eceen tric lever 17 is operated to hold thecarriage, and the hinged bottom of the bucket is opened and the contentsdumped.

The advantages of my excavator attachment will be readily appreciated bythose skilled in the art. It is of very simple construction andoperation, and can be quickly and easily combined with the boom ol anyordinary hoisting-derrick, after the saine is in position and ready foruse.

It will be understood that the details of construction ol' myexcavatorattachment may be varied somewhat, il desired.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. An excavating attachment, consisting ol a slide or carriage,supported on the movable inclined boom of a derrick, and adapted totravel lengthwise thereon, and a loop or strap pivotally attached tosaid slide or carriage, and means for clamping the loop or strap to theboom, to hold. the carriage at any desired point thereon, and anexcavating-bneket and bueketbooin, said boom pivotally attached at itsinner end to said carriage to nieve with it, and hoisting-tacklc tooperate said bucket, substantially as set forth.

2. An excavating attachment, consisting of a slide or carriage adaptedto be mounted on the movable inclined boom of a derrick, and to travellengthwise thereon, and a loop or strap pivotally attached to thecarriage, and an eccentric lever for clamping said strap to the boom tohold the carriage thereon, and an excavating-bucket and buckct-boou1,said. boom not having any longitudinal motion, and Apivotally attachedat its inner end to said carriage to move with it, and hoistingtackle tooperate said bucket, substantially as set forth.

3. The combination with the movable in clined boom o a derrick, of anexcrwator- IOO IIO

bucket having a bucket-boom rigidly attaohed thereto at one end, andpivotally attached at its other end to a slide or carriage supported andadapted to travel lengthwise on said inclined boom, and said slide orearriage, and means for holding it at any desired point on said boom,said means consisting of a loop or strap pivotally attached to theoarriage, and means for Clamping the loop or strap to the boom,substantially as set forth.

PETER J. MALONEY. Vitnesses:

JOHN'C. DEWEY, M. J. GALVIN.

